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(11) | EP 0 156 130 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Process for the preparation of blown film and oriented film |
(57) Blown film on the basis of low-density polyethylene is prepared by extruding the
molten polymer at melt temperatures at the die gap of below 135°C. Films that have
been prepared this way have special orientation as a result of which good mechanical
and optical properties are present. Oriented films are determined by X-ray diffraction
analysis and have an intensity ratio of the 110 reflection band max./min. of at least
20, and an angle a between the average orientation direction of the polymer molecules
and the film extrustion direction of at most 20°. |